Trion-to-exciton upconversion dynamics in monolayer WSe2
Trion-to-exciton upconversion dynamics in monolayer WSe2
复制标题
单层 WSe2 中 Trion 到激子的上转换动力学
DOI:
10.1063/5.0012116
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发表时间:
2020-08
影响因子:
4
通讯作者:
Baoli Liu
中科院分区:
文献类型:
--
作者:
Wenze Lan;Jianfang Wang;Ming Xin;Yuan Huang;Changzhi Gu;Baoli Liu
We investigate the trion-to-exciton upconversion dynamics in a large-scale mechanically exfoliated tungsten diselenide (WSe2) monolayer covered by poly(methyl methacrylate) using two-color ultrafast pump-probe spectroscopy. With resonantly pumping the trion and probing the exciton transitions, we find a fast trion-to-exciton upconversion process with the upconversion time about ∼2 ps. Combined with the temperature-dependent transient reflection and helicity-resolved Raman measurements, we further demonstrate that the upconversion is indeed a phonon-mediated process in our sample.
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